Some Post Offices also take Evri items.

If you do want to sell again. You could turn off one of them here: https://www.ebay.co.uk/ship/prf/simpledelivery

Ebay may still give you a label for the turned off one as an exception.

And turning off one makes some postage bands more expensive. See https://www.ebay.co.uk/sellercentre/postage/simple-delivery